=20
That=92s a great idea. Do you perhaps have some sample code to =
demonstrate
this? It will be much appreciated :-)

Say for example I want a 24 bit signed variable, using a struct for =
storage,
how would I:

Decrement that value
Compare it in an 'if' statement?

I can see how I would do it using a pointer to the struct, but wouldn't =
the
storage for the pointer negate the space saved by using a 3 byte struct?

Sorry if this is a stupid question, I know C (or I think I do), but are
relatively new to PIC's and the need to save as much RAM as possible. =
Using
C on a PC with 512MB of RAM this is less of an issue ;-).

  _____ =20

Andr=E9 Miller =09

-----Original Message-----
From: pic microcontroller discussion list =
[mailto:PICLIST@MITVMA.MIT.EDU] On
Behalf Of Gerhard Fiedler
Sent: 01 April 2004 01:33 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC:] Microchip C18, or HI-TECH PICC18?

>>Have you ever found you needed a 24 bit integer datatype and wished=20
>>PICC had support for it?
>
> Frequently. There are many cases where 16 bits isn't quite enough but =
32
is wasteful.
> Probably less of an issue on the PIC18, but on the 16 series, RAM is=20
> usually the first thing you run out of.

For me that's "sometimes". In those cases I use 3 byte structs for =
storage
and the built-in 32 bit routines for the calculations. I've never had a =
case
where the additional resources that were needed to do the 32 bit
calculations (temp register, instruction cycles) were a problem.

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